Collapsible falsework for concrete floors



H. J. BAKER.

COLLAPSIBLE FALSEWORK FOR CONCRETE FLOORS.

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APPUCATlON FILED IAN.21.1921.

H.1. BAKER.

COLLAPSIBLE FALSEWORK FOR CONCRETE FLOORS.- APPLICATloN FILED JAN.21, 1921.

1,425,23; Patented Aug. 15, 1922.,

2 SHEETS-SHEET 2.

I' joists.

,on the line `7 7 of Fig. 1; and Fig. 8. is a, transverse section on the line 8 8 of Fig. 7

H UGI'BI J'. BAKER, 0F INDIANAPOLIS,v INDIANA.

' COLLPSIBLE FALSEWORK FOR CONCRETE FLOORS.

To all whom it mary concern.'

Be it known that I, HUGH J. BAKER, a citizen vof the United States, residing vat Indianapolis, in the county .ofMarion and State of India-na, have invented a new and useful Collapsible Floors, of which the following is a specilication.

It isthe object of my invention to produce acollapsible falsework for ribbed concrete fioors, which falsework has a collapsible supporting skeletonLpreferably formed of separable structural-steel parts, arranged to support a sheet-metal sheath which directly engages the concrete, and which isreadily adaptable to various lengths and depths of joists and various spaces between The accompanying drawings illust-rate my invention: v Fig. 1 is a'vertical longitudinal section through my improved .falsework the superposed concrete floor; F1 2 is a fragment-ary pla-n of the falsewor of the left-hand part of Fig. l; Fig. 3 is a perspective sectional View of, a fragment of oneof the side trusses, showing the plate to which a cross member 1g. 5 1s a perspective view, on asomewhat smaller scale, of one of the sheath sections;

Fig. 6 is a fragmentary vertical section on the line 6 6 of Fig. 1, on a somewhat enf. larged scale, showing part Aofthe concrete in place, and with the sheet-metal sheath removed in -theright-hand half of ure; Fig. 7 is an enlarged vertical section The falsework is .composed generally of side trusses 10, cross 'members 1l-, and a sectional sheet-metal sheath 12.` The side .members l0 correspond in height to the maximum depth of the proposed concrete ribs or joists l3,.and-are made as structuralsteel trusses 1with vertical and oblique memsuitably fastened together, conveniently 'by v bers 14 andalh connecting upperv and lower members 16 and 17, which latter .are in the form of oppositely disposed. angle irons parallel to each other as. is .clear from Figs.`

3, 6,l and 7. yThe partsof each'truss vare spot-welding. 'The sideIl trusses 1'0 are suit-- ably supported. As shown, each side truss is half the length between 'adjaent bearrisl Specication of Letters Patent. Application filed January 21, 1921.

Falsework for Concrete collapsible showing bothA its supports and .of the trusses,

Y is attached; Fig. 4 is a perspective View of such cross member; V3o F the tigf Patented" Aug. i5, 192e. serial No. 438,814.

or girders 18 of the concrete floor two trusses ,are used to span the space beends of the side trusses at thebeams or girders may the' sides of the forms 21 for such beams or glrders, the bottoms of which forms are supported on suitable shores 22. The ends of the slde trusses between the beams are though it is not essential shown as meeting, that they meet-as they may be spaced apart more or less if the distance between beams makes that desirable in order to use trussesl of standard length, and as shown are carried in common by bent-iron arms 23 removably 70 fastened, asby bolts 24, to intermediate 'supporting' shores25, each shore 25 having a..plurality of bolt-receiving holes 26, prefa line which is slightly oblique with respect to the plane of the side trusses as a whole, sothat when the line of such holes is vertical the trusses Aas a whole will :be slightly erably arranged in and the falsework the joists 13. If-it isfl desired to make the joists 13 flarmg where they join the beams or girders 18,

the slde members 10 may be slightly bent, 95

as shown' in Fig. 2, so that the two side members of a pair approach each other at.

theirends toward each beam. These samel ends o f the side membersmay be cut olf at an obllque angle 27 if it is desired that the 100 A,

beam or girder 18 join the floor 19 withflaring si'des, as is indicated in Fig. 1, which oblique cut-olif' 27 may or the way to the bottom of the side members.

bottom, -and side pieces, and the corners connected by oblique pieces, as is clear from i 4, 6, and 7. The top and bottom pieces are conveniently angle irons, but the end pieces are Hats; and in these end pieces rest on removable strips 20 on 60 13 and the necessary part 75 an attaching liange, not only 80 tilted, as is shown in Figs. 6 and 7, to provide downward draft between may not extend all,v

he cross members 1 1 are formed of top, 105

holes 28 corresponding with the holes 26 to .receive bolts29 by which the cross pieces may be fastened to theside trusses. The

between the girders, and at such ends the cross members 11 may also be provided if desired, as shown, though they are not essent-ial. The lines of the holes 28 are paralle'l to each other, and perpendicular to the top and bottom pieces of the cross members 11, and are thus vertical when the parts are assembled so that such cross members may be reversed in position without affecting the tilting which is given the side trusses. The cross members 11 are interchangeable throughout the greater part of the length of the side trusses, but those close to'beams 18 maybe made successively shorter, as is clear from Fig. 2, to correspond to the bending `of the side trusses if they are bent. To pre-v vent skewing between the side trusses, supplementary oblique cross rods 30 may be provided to interconnect the two side trusses of a pair, as is clear from Fig. 2.

The side trusses and cross members when assembled constitute a skeleton framework, which is collapsible by the removal of the attaching bolts 29. lin this skeleton framework, the horizontal parts of the angle irons 16 of the two side trusses of a pair project toward'each other, while the horizontal parts K 'metal sectional sheath 12. e sheathxconsists fundamentallyofl U-shaped 40' sections, such as shown in Fig. 5, which tv over corners formed by the angle irons 16 of a v -pair of side trusses, and extending down .along the-sides. of such side trusses-to the ing of the side truss if it is bent, fas is" clear 'ofthe angle iron 17 of such pair. project away from eachother and toward the adjacent pairs, this skeleton framework -is placed the sheet- -this skeleton framework, extending upon the top thereof and fitting around the --inner corners ofthe lowerl angle irons 17. These sections "preferably meet `one another on butt joints 31, but may overlap or have` other kinds of joints as desired,v and -the'end section 12 is tapered to'conform tothe-'bendfrom Fig. 2.. Instead of U-shaped sections at the oblique ends 27, ll p rovide a flat plate pieces 33 may be permanently fastened inl 32:.which lies' upon .such oblique ends, as 1s clear from Figs. l1 and .2; rand on the sides .of the side -trusses at such end 'll provide triangular corner pieces 33.` The corner place, but the plate' 32 is preferably` detach-4 able fromthe side trusses, as by being Aattached thereto by bolts 34. .Bottom plates 35 are lsupported on the projecting horizontallanges of the adjacent bottom angle-v irons 17 .of each pair of trusses, either by resting directly thereon if the joist 13 is of as is clear from Fig. 5. -Over This sectional.

messes maximum depth, as is indicated in Fig. 7,

or by resting on blocks 36 which in turn. .rest on such an le irons ,17 to make the joist 13 of less dept as is indicated' in Fig. 6. The bottom plates 35l are notched at their ends where necessary to clear the shores 25,

@so that they may be removed while such .29, after'which thesheathing sections 12,v

the .oblique end plates32, the corner plates 33 if they are not permanently attached .to

the side. trusses, and the bottom. plates 35. and 37, are put in place as shown. The 90 up by blocks36-if that is desired in orderl bottom plates 35 and 37 may be blocked fastened to the eros/s tomake the joists 13 of less than maximum f depth.-v4 The distance between the two side trusses may be varied, whilestill using the same side trusses, by using cross members 11 and sheath sections 12 of desire`d width.

When the falsework hasbeen setnp, the

concrete for the floor 19 is poured,forming such Hoor with its joists andfgirders. The reinforcing which would ordinarily be -used in thisconcrete is not shown, since that is no part of my present invention.l When vthe concrete has suilicientlyv set, the falsework may be removed, the removalusually being piecemeal. ln removing the 'falsework, the bolts 29 are taken out to release the cross loof members 11', which are then removed. This also releases the side trussesv from the arms 23. The side trusses may now be mowed relatively, and the two side trusses of each -pair yare swung toward each other and lowered. Then the sheet-metal sheathing sec,- tions 12 maybe pulled ofi' without difficulty-V and without tearingl the concrete loose." The bottom plates 35 may now be'stripped off.

All this-'is done without disturbing the girder forms 21 or the supporting shores 22 and 25, which mayre'm'ain in place until thev concrete has vfurther set, '.the small plates 37 remaining on top ofthe shores 25 if such plates are used.

'T claim",r as my invention:` 1. A falsework for concrete floors, comprising side members, cross members s eparably attachable to said side members 'to constitute therewith a framework, and a `sheet-metal sheath detachably resting upon.. said framework, said cross members and` side members being provided with bolt holes for receiving attaching bolts, and the bolt" .operating rows of holes for holes being arranged to make the side members which are joined by said cross members tilt with respect to each other.

2. A falsework for concrete floors, comprising side members, cross members separably attachable to said side members to constitute therewith a framework, and a sheet-metal sheath detachably resting upon said framework, said cross members and said side members being provided with cooperatin rows of holes for receiving attaching bolts, the rows of holes in the cross members being parallel to each other. l

3. A falsework for concrete floors, comprising side members, cross members separably attachable to said side members to constitute therewith a framework, and a sheet-metal sheath detachably resting upon said framework, said cross members and said side members being provided with coreceiving attaching bolts, the rows of holes in the cross members being parallel to each other, and the rows of holes in the side members be ing oblique with respect to the planes of the side members.

4. A falsework for concrete floors, comprising side members, cross members separably attachable to said side members to constitute therewith a framework, and a sheet-metal sheath detachably resting upon said framework, said cross members and said side .members being provided with cooperating rows of holes for receiving attaching bolts, the rows of holes in the side members being oblique with respect to the planes of the side members.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 4th day of January, A. D. one thousand nine hundred and twenty.

HUGH J. BAKER. 

